Miniature rose plant named ‘KORburnab’

ABSTRACT

A new and distinct variety of miniature rose with long lasting, novel white flowers, and dark green and attractive foliage. It exhibits compact, uniform growth and flowering under greenhouse conditions when grown as a potted floral plant. The new variety propagates well from cuttings and by grafting. This new and distinct variety has shown to be uniform and stable in the resulting generations from asexual propagation.

SUMMARY OF THE INVENTION

Genus, species and variety denomination: The botanical classification ofthe new rose plant is Rosa hybrida, ‘KORburnab’.

CROSS REFERENCES AND FEDERAL R&D STATEMENT

There are no cross referenced or related applications. This variety wasdeveloped without the aid of any research grant.

BACKGROUND OF THE INVENTION

The present discovery constitutes a new and distinct variety of aminiature pot rose plant which was discovered in a cultivated area inFebruary, 2009. The new rose variety resulted from a naturally occurringmutation of unknown causation on a basal shoot of ‘KORpagbel’, apatented rose from the inventor described and illustrated in U.S. PlantPat. No. 17,183 issued on Nov. 7, 2006. The cultivated area consists ofa glasshouse located at the nursery of the inventor located inOffenseth-Sparrieshoop, Germany.

The new rose plant was asexually propagated by vegetative cuttings forfurther evaluation. This new and distinctive miniature rose variety isnamed ‘KORburnab’.

SUMMARY OF THE DISCOVERY

The new rose plant may be distinguished from ‘KORpagbel’ by thefollowing combination of characteristics:

-   -   1. Upon opening, the petal color of ‘KORburnab’ is White Group        155B. The petal color of ‘KORpagbel’ upon opening is Red Group        49B.    -   2. Upon opening, the petaloid color of ‘KORburnab’ is White        Group 155B. Upon opening, the petaloid color of ‘KORpagbel’ is        Red Group 41C.    -   3. The growth of ‘KORburnab’ is less vigorous and is more        compact than the growth of ‘KORpagbel’.    -   4. The foliage color of ‘KORburnab’ is Green Group 138A and the        foliage color of ‘KORpagbel’ is Green Group 137A.

The instant plant ‘KORburnab’ is significantly different from otherwhite miniatures that are known by the inventor. Several observabledifferences exist between ‘KORburnab’ and ‘KORpedia’, a patented rose bythe inventor that is described and illustrated in U.S. Plant Pat. No.19,638 issued on Jan. 20, 2009:

-   -   1. The average flower diameter of ‘KORburnab’ is 30-40 mm when        open. The average flower diameter of ‘KORpedia’ 60 mm.    -   2. The foliage of ‘KORburnab’ is smaller than that of        ‘KORpedia’. The terminal leaflet of KORpedia is 45 mm(l)×25        mm(w), while the terminal leaflet of ‘KORburnab’ is 25-27        mm(l)×16-18 mm(w).    -   3. The average flower petal size of ‘KORpedia’ is 30-35        mm(l)×25-35 mm(w), while the average flower petal size of        ‘KORburnab’ is 20 mm(l)×20 (w).

The new and distinct rose plant was selected due to it its:

-   -   1. Compact and uniform growth and flowering under greenhouse        conditions when grown as a potted floral plant;    -   2. Abundant, long lasting, and attractive white flowers on        upright stems;    -   3. Resistance to diseases encountered in greenhouse and nursery        culture; and    -   4. Suitability for production from softwood cuttings in floral        and nursery containers;

This combination of qualities is not present in prior rose cultivarsknown to the inventor. These objectives have been substantially achievedand in that distinguish ‘KORburnab’ from all other varieties of which weare aware.

As part of the rose evaluation program, Tim-Hermann Kordes asexuallypropagated the mutation by rooting cuttings, and conducted evaluationsand observations on the resulting plants in a controlled glasshouseenvironment in Offenseth-Sparrieshoop, Germany in May, 2009. Theresulting rooted plants exhibited distinctive physical and biologicalcharacteristics.

These initial and other subsequent propagations conducted in controlledglasshouse environments show that the foregoing and all othercharacteristics of ‘KORburnab’ come true to form and are transmittedthrough succeeding generations.

BRIEF DESCRIPTION OF THE DRAWING

The accompanying drawing shows as true as is reasonably possible toobtain in color photographs of this type, the typical characteristics ofthe buds, flowers, leaves, and stems of ‘KORburnab’. Specificallyillustrated is: a flower bud, partially opened bloom, open bloom,detached sepals, receptacle, peduncle, juvenile foliage, stem exhibitingthorns, and leaves.

DETAILED BOTANICAL DESCRIPTION

The following is a description of ‘KORburnab’, as observed in its growthin November, 2009 in a glasshouse at Offenseth-Sparrieshoop, Germany onplants of five months of age. Color references are made using The RoyalHorticultural Society (London, England) Colour Chart, 2001 except wherecommon terms of color are used.

For a comparison, several physical characteristics of the rose variety‘KORpagbel’, a rose variety from the same inventor described andillustrated in U.S. Plant Pat. No. 17,183 and issued on Nov. 7, 2006 arecompared to ‘KORburnab’ in Chart 1.

CHART 1 Trait ‘KORburnab’ ‘KORpagbel’ Petal Color White Group 155B RedGroup 49B Petaloid Color Green-Yellow Red Group 41C Group 1C Sepal ColorGreen-Yellow Green Group 137A Group 144B Mature Foliage Green Group 138AGreen Group 137B Color

-   Parentage: Spontaneous mutation of ‘KORpagbel’ (U.S. Plant Pat. No.    17,183).-   Classification:    -   -   Botanical classification.—Rosa hybrida, ‘KORburnab’.        -   Commercial classification.—Miniature rose.

FLOWER AND FLOWER BUD

-   Blooming habit: Recurrent.-   Flower bud:    -   -   Size.—Upon opening, 15-20 mm in length from base of            receptacle to end of bud and 10-12 mm in diameter at its            widest point.        -   Bud form.—Long. Pointed ovoid.        -   Bud color.—As sepals first unfold, bud color is White Group            155A. When ¼ open, the upper surface of petals is White            Group 155A, and the lower surface is White Group 155A.        -   Sepals.—Size: Average 18-20 mm long×5-6 mm wide. Shape:            Sepals generally subulate. Sepal apex is generally cirrose.            Strong foliaceous appendages on three of the five sepals.            Base is flat at union with receptacle. Quantity: Five.            Margins: With stipitate glands. Surface texture: Inner side:            Covered in fine hairs. Outer surface: Smooth. Stipitate            glands are present. Color: Upper surface is Yellow-Green            Group 144B. Lower surface is Yellow-Green Group 144A.-   Receptacle: Surface: Smooth. Color: Yellow-Green Group 144A. Shape:    Funnel. Size: 5 mm (h)×5 mm (w).-   Peduncle:    -   -   Surface.—With stipitate glands.        -   Length.—12-15 mm average length.        -   Diameter.—1-1.5 mm average diameter.        -   Color.—Yellow-Green Group 144B.        -   Strength.—Somewhat strong.        -   Borne.—Most commonly singly, with 1-3 blooms per stem.-   Flower bloom:    -   -   Fragrance.—Light.        -   Duration.—Long lasting. A blooming plant with flowers has a            commercial shelf life of 10 to 12 days. The blooms have            duration on the plant of approximately 10 to 12 days. As a            cut flower, 6 to 8 days.        -   Size.—Average for a 10 cm pot rose. Average flower diameter            is 30-40 mm when open. Average flower depth is 25 mm.        -   Form.—Shape of flower when viewed from the side: Upon            opening, upper part: Flat. Upon opening, lower part:            Flattened convex. Open flower, upper part: Flat. Open            flower, lower part: Flattened convex.-   Color:    -   -   Upon opening, petals.—Outermost petals: Outer Side: White            Group 155A. Inner Side: White Group 155A. Innermost petals:            Outer Side: Green-Yellow Group 1D. Inner Side: Green-Yellow            Group 1D.        -   Upon opening, basal petal spots.—Basal petal spot, outermost            petals: Outer Side: Green-Yellow Group 1C. Inner Side:            Yellow Group 2B. Basal petal spot, innermost petals: Outer            Side: Yellow Group 2B. Inner Side: Yellow Group 2B.        -   After opening, petals.—Outermost petals: Outer Side: White            Group 155B. Inner Side: White Group 155B. Innermost petals:            Outer Side: Green-Yellow Group 1D. Inner Side: Green-Yellow            Group 1D.        -   After opening, basal petal spots.—Basal petal spot,            outermost petals: No distinctive coloration at petal base            observed. Basal petal spot, innermost petals: Outer Side:            Yellow Group 2B. Inner Side: Yellow Group 2C. Variegations:            No distinctive coloration observed.-   General tonality: On open flower, tonality is White Group 155A. No    change in the general tonality at the end of the 7^(th) day.    Afterwards, general tonality is White Group 155B.-   Petals:    -   -   Petal count.—Approximately 24-28 petals under normal            conditions.        -   Petal reflex.—Petals reflex slightly.        -   Petal edge.—With point in center of margin.        -   Petal shape.—Round. Apex shape is round. Shape of base is            acute.        -   Petal size.—20 mm long×20 mm wide.        -   Thickness.—Average.        -   Petal arrangement.—Not formal.        -   Petaloids.—Present.        -   Petaloid count.—Average of 4-6 per flower.        -   Petaloid edge.—With point in center of margin.        -   Petaloid texture.—Smooth.        -   Petaloid shape.—Apex: rounded. Base: pointed.        -   Petaloid size.—Petaloids are 5-6 mm long and 3-4 mm wide.        -   Petaloid color.—Color of inner side is Green-Yellow Group            1C. Color of outer side is Green-Yellow Group 1C.-   Reproductive organs:    -   -   Pistils.—Approximately 30-40 present. Stigmas: Location:            Slightly inferior in position to anthers. Color:            Greyed-Yellow Group 160D. Styles: Length: 2-3 mm long.            Color: Greyed-Yellow Group 160D.        -   Stamens.—Approximately 40-50 on average and regularly            arranged. Anthers: Size: 2 mm long. Color: Yellow-Orange            Group 16B & 16C. Pollen: Absent. Filaments: Color: Yellow            Group 9A. Length: 5-6 mm.

THE PLANT

-   -   -   Plant growth.—Moderately vigorous. Upright to bushy habit.            When grown as a 10 cm pot plant, the average height of the            plant is 18-20 cm and the average width is 16-18 cm.        -   Stems.—Stem color: Young wood: Yellow-Green Group 144A.            Older wood: Green Group 138B. Stem surface: Young wood:            Smooth. Older wood: Rough.        -   Prickles.—Present. Incidence: 8-10 per 10 cm of stem. Size:            Average length: 5 mm. Color: Immature prickles: Yellow-Green            Group 145C. Mature prickles: Greyed-Orange Group 165C.            Senescing to Greyed-Orange Group 165A. Intonations of            Greyed-Red Group 182B. Shape: Linear. Anthocyanin:            Greyed-Red Group 182B.        -   Leaves and leaflets.—Normally 3-5 leaflets on normal leaves            in middle of the stem. Venation pattern: Pyramidal net            pattern. Leaf size: 70-80 mm (l)×135-140 mm (w). Quantity:            Average. Texture: Upper side of leaflet: Semi glossy.            Smooth. Under side of leaflet: Matte. Rough. Color, mature            foliage: Upper Leaf Surface: Green Group 138A. Lower Leaf            Surface: Green Group 138B. Color, juvenile foliage: Upper            Leaf Surface: Yellow-Green Group 144A. Lower Leaf Surface:            Yellow-Green Group 146D. Anthocyanin intonation: Present.            Location: Intonations present on leaf margins. Color:            Greyed-Red Group 182A.        -   Stipules.—Size: 8-11 mm long. 7-8 mm between the tips of the            stipule. Main body of stipule 3-4 mm in width. Shape: Apex:            Apiculate. Base: Fused to the petiole. Stipule color:            Yellow-Green Group 144A. Anthocyanin: Greyed-Red Group 182B.            Presence of stipitate glands: Present on margins. Margins:            With stipitate glands.        -   Petiole.—Length: 8 mm -12 mm. Diameter: 1 mm. Petiole color:            Yellow-Green Group 144A. Color of anthocyanin present on            juvenile tissue: Greyed-Purple Group 184B. Underneath: A few            small prickles underneath. Stipitate glands: Limited numbers            of stipitate glands on margins.        -   Petiole rachis.—Length: 8-10 mm. Diameter: 1 mm. Color:            Yellow-Green Group 144A. Anthocyanin present on juvenile            tissue. Anthocyanin color: Greyed-Purple Group 184B.            Margins: With stipitate glands. Prickles: Lacking. Stipitate            glands: Limited numbers of stipitate glands on margins.        -   Leaflets.—Size: Average size of the terminal leaflet is            25-27 mm (1)×16-18 mm (w). Shape: Elliptic. Base: Rounded.            Apex: Acute. Surface: Upper side: Semi-glossy. Lower side:            Semi-glossy to matte. Margins: Finely serrated. Texture:            Thin.

-   Hips/seed formation: None observed. The plant has not been grown to    the stage of hip and seed development due to its use as a flowering    potted plant.

-   Winter hardiness: Due to the variety's principal use in greenhouses,    winter hardiness has not been evaluated.

-   Disease resistance: Above average resistance to Powdery mildew    (Sphaerotheca pannosa) and Botrytis (Botrytis cinerea) diseases    under normal greenhouse growing conditions in    Offenseth-Sparrieshoop, Germany.

I claim:
 1. A new and distinct miniature rose plant of the varietysubstantially as illustrated and described herein.